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Engine Control Module (ECM) X1 (LE5)

Fig 1: Engine Control Module (ECM) X1 (LE5)
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (LE5)

Pin Wire Circuit Function
1 0.5 D-BU 1161 APP Sensor 1 Signal
2 - - Not Used
3 0.5 D-BU 5985 Accessory Wakeup Serial Data
4 - - Not Used
5 0.5 D-GN 335 Low Speed Cooling Fan Relay Control
6 0.5 D-GN/WH 465 Fuel Pump Relay Control - Primary
7 - - Not Used
8 0.5 TN 5514 Low Reference
9 0.5 TN/WH 3121 HO2S Low Signal Sensor 2
10 - - Not Used
11 0.5 D-GN/WH 6294 Clutch Position Sensor Low Reference
12 - - Not Used
13 0.5 YE 5991 Powertrain Relay Coil Control
14 - - Not Used
15 0.5 GY/WH 3122 HO2S Heater Low Control - Bank 1 Sensor 2
16 - - Not Used
17 0.5 PU 3120 HO2S High Signal Bank 1 Sensor 2
18 0.5 L-BU 1162 APP Sensor 2 Signal
19 0.5 PK 639 Ignition 1 Voltage
20 0.5 RD/WH 40 Battery Positive Voltage
21 0.5 PU 1272 Low Reference
22-23 - - Not Used
24 0.5 BN/WH 6281 Fuel Level Sensor Low Reference
25 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
26 - - Not Used
27 0.5 BN/WH 419 MIL Control
28-29 - - Not Used
30 0.5 D-GN/WH 459 A/C Compressor Clutch Relay Control
31 - - Not Used
32 0.5 PU/WH 6386 Starter Enable Relay (PPEI 3) Control
33-34 - - Not Used
35 0.5 TN 2760 Low Reference
36 - - Not Used
37 0.5 YE 492 MAF Sensor Signal
38 - - Not Used
39 0.5 D-BU 1936 Fuel Level Sensor Signal - Secondary
40 0.5 L-BU 1937 Secondary Fuel Level Sensor Signal
41 0.5 BN 1271 Low Reference
42 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
43 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+
44 0.5 TN 2501 High Speed GMLAN Serial Data Bus-
45 0.5 D-GN 6293 Clutch Position Sensor Supply Voltage
46 - - Not Used
47 0.5 WH/BK 1164 5-Volt Reference
48 - - Not Used
49 0.5 D-BU 473 High Speed Cooling Fan Relay Control
50-53 - - Not Used
54 0.5 PU/WH 821 VSS High Signal
55 0.5 WH 17 Stop Lamp Switch Signal or Stop Lamp Supply Voltage
56 - - Not Used
57 0.5 OG/BK 1786 Park/Neutral Signal (1)
58 0.5 L-BU 6289 Induction Air Temperature Sensor Signal
59-60 - - Not Used
61 0.5 L-GN 6338 Manual Transmission Clutch Position Sensor Signal Position
62-64 - - Not Used
65 0.5 GY 2700 5-Volt Reference
66 0.5 BN/WH 6283 Fuel Tank Vapor Pressure Sensor Supply Voltage
67 0.5 TN 1274 5-Volt Reference
68-69 - - Not Used
70 0.5 WH 1310 EVAP Canister Vent Solenoid Control
71 0.5 D-BU 38 Backup Switch Signal
72 - - Not Used
73 0.8 PK/BK 6341 Powertrain Relay Contact Signal
Connector Part Information 
  • OEM: 15499466
  • Service: 88988931
  • Description: 73-Way F MX123 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 1, 3, 5- 6, 8-9, 11, 13, 15, 17-21, 24-25, 27, 30, 32, 35, 37, 39, 40-45, 47, 49, 54-55, 57-58, 61, 65- 67, 70- 71
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
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